KR100299444B1 - Refractory powder for thermal spray coating - Google Patents
Refractory powder for thermal spray coating Download PDFInfo
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- KR100299444B1 KR100299444B1 KR1019960067552A KR19960067552A KR100299444B1 KR 100299444 B1 KR100299444 B1 KR 100299444B1 KR 1019960067552 A KR1019960067552 A KR 1019960067552A KR 19960067552 A KR19960067552 A KR 19960067552A KR 100299444 B1 KR100299444 B1 KR 100299444B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
- C04B2235/5224—Alumina or aluminates
Abstract
Description
본 발명은 각종 공업용 노체 진공탈가스 설비, 래들, 턴디쉬 및 가열로를 비롯하여 소각로 유리용해로, 전기로 등에 사용되고 있는 산성, 중성 및 염기성 내화물의 손상부위를 불꽃용사보수하는 분말용사재에 관한 것으로서, 보다 상세하게는 노체설비의 장수명화 및 생산성 향상을 위한 내화분말 보수재로서 특히 노체 가동중의 고온에서 보수할 수 있는 불꽃용사용 내화분말 재료에 관한 것이다.The present invention relates to a powder spray material for thermally repairing damaged parts of acid, neutral and basic refractory materials used in incinerator glass melting furnaces, electric furnaces, etc., including various industrial furnace vacuum degassing facilities, ladles, tundish and heating furnaces. More particularly, the present invention relates to a refractory powder material for flames that can be repaired at a high temperature during furnace operation as a fireproof powder repair material for long life and productivity improvement of a furnace equipment.
공업용 노체내화물의 손상부위에 대한 열간보수기술로서의 불꽃용사 보수방법은 2000℃ 이상의 고온, 고속 불꽃을 발생시켜 내화분말재료를 그 속으로 분사시켜 내화물 손상부위에 용융 또는 반용융상태로 부착시키는 일종의 세라믹 용접법에 해당된다. 특히 철강업용 노체내화물은 대개 1350℃ 이상의 고온에 사용됨으로 불꽃 보수하기 위한 내화분말재료 또한 1650℃ 이상의 용융점을 가지는, 고융점의 분말재료를 이용한다.Flame spray repair method as a hot repair technique for damaged parts of industrial furnace refractories is a kind of ceramic that generates high-temperature, high-speed flames of 2000 ℃ or higher and sprays refractory powder material into it to melt or semi-melt the refractory damaged areas. Corresponds to the welding method. In particular, the furnace refractories for the steel industry are generally used at high temperatures of 1350 ° C. or higher, and therefore, refractory powder materials for flame repair also use high melting point powder materials having a melting point of 1650 ° C. or higher.
이러한, 불꽃용사용 내화분말재료는 노체 내화물과 유사한 마그네시아계, 알루미나-스피넬계, 실리카계 등의 비피복형 내화분말과 내화분말에 저융점 물질을 피복한 피복형 내화분말 재료로 대별할 수 있다.Such refractory powders for flame can be roughly classified into uncoated refractory powders such as magnesia-based, alumina-spinel-based and silica-based coatings and coated refractory powders having low melting point materials coated on the refractory powders. .
이와 같이 구분되는 이유는 내화분말중 마그네시아, 알루미나와 같은 재료는 융점이 각각 2850℃, 2015℃ 로서 2000-2600℃ 영역의 불꽃 속에서 0.1-0.2초 정도의 극히 짧은 체류시간 동안에는 전혀 용융이 되지 않기 때문에, 이 불꽃 온도에서 용사재료를 손상된 내화물 표면에 부착시키기 위해서는 반드시 저융점재료 및 전로슬래그나 규회석, 시멘트 등의 복합물질을 소량 첨가하거나, 피복하고, 또한 산화에 의해 발열반응을 하는 알루미늄, 규소, 마그네슘-알루미늄, 합금분말 등의 금속 분말이나 코크스분말 등을 일부 첨가해서 용사 해야만 부착시킬 수 있기 때문이다.The reason for this distinction is that materials such as magnesia and alumina in refractory powders have melting points of 2850 ℃ and 2015 ℃, respectively, so that they do not melt at all during the extremely short residence time of about 0.1-0.2 seconds in the flame of 2000-2600 ℃. Therefore, in order to adhere the thermal spray material to the damaged refractory surface at this flame temperature, a small amount of a low melting point material, a composite material such as converter slag, wollastonite, cement, or the like must be added or coated, and aluminum and silicon are exothermicly reacted by oxidation. This is because metal powders such as magnesium-aluminum, alloy powder, coke powder and the like can be added and sprayed to attach them.
지금까지 알려져 있는 공지기술들은 대개 다음의 범주에 속한다. 즉,Known techniques so far known generally fall into the following categories. In other words,
1) 입경 200-10㎛ 로 조정된 고융점 내화재료분말의 입자표면을 평균입경 10-0,1㎛ 의 이소결성(易燒結性) 산화물 초미분말로 피복한 마그네시아-산화물계 불꽃용사용 내화분말(일본 특허공개 소 61-186258)1) Refractory powder for magnesia-oxide type flame which coated particle surface of high melting point refractory material powder adjusted to 200-10㎛ particle size with ultrafine powder of sintered oxide with average particle diameter of 10-0,1㎛ (Japanese Patent Publication No. 61-186258)
2) 입자크기 44㎛ 이하의 금속분말을 마그네시아 등의 고융점 재료에 피복하여 제조한 용사재료(일본 특허공개 소 60-161379)2) Thermal spraying material manufactured by coating metal powder with particle size of 44 μm or less on high melting point material such as magnesia (Japanese Patent Publication No. 60-161379)
3) 불꽃온도를 높여 용사재료의 부착율을 향상시킬 목적으로 코크스 분말을 첨가하여 용사재료를 제조하는 방법(일본 특허공개 소 62-41772)3) A method of manufacturing a thermal spraying material by adding coke powder for the purpose of increasing the flame temperature and improving the adhesion rate of the thermal spraying material (Japanese Patent Publication No. 62-41772).
4) 마그네시아 입자에 미세한 저융점 물질을 피복하여 제조하는 방법(대한민국 특허출원 제 93-23742)등이 알려져 있다.4) A method of coating a magnesia particle with a fine low melting point material (Korean Patent Application No. 93-23742) or the like is known.
그러나, 상기 종래 용사재들은 다음과 같은 문제점이 있다.However, the conventional thermal spray materials have the following problems.
즉, 1)의 용사재료는 마그네시아가 용융온도 2850℃ 의 난용성 물질이므로 용사시 프로판가스와 산소에 의한 2500-2600℃ 정도의 불꽃 온도에서는 용융되지 않는 점에 착안하여 이소결성 산화물인 실리카(SiO2), 알루미나(Al2O3), 스피넬(spinel) 등을 마그네시아 입자표면에 피복하는 것을 특징으로 하고 있지만, 이것은 마그네시아입자에 비교적 고융점의 산화물을 피복하는 방법임으로 66-73% 정도로 부착율이 아주 낮아 경제성이 없으며 산업상 실용성이 뒤떨어지는 문제점이 있다.That is, since the thermal spray material of 1) is magnesia, a poorly soluble material having a melting temperature of 2850 ° C, silica is a sinterable oxide (SiO) because it does not melt at a flame temperature of 2500-2600 ° C by propane gas and oxygen during thermal spraying. 2 ), alumina (Al 2 O 3 ), spinel (spinel) and the like is characterized in that the surface of the magnesia particles, but this is a method of coating the oxide of a relatively high melting point to the magnesia particles, the adhesion rate of about 66-73% This is very low economical and there is a problem that the industrial practicality is inferior.
또한, 상기 2)의 용사재료는 고융점의 원료에 산화발열성 금속분말만을 사용하기 때문에 고융점의 원료를 충분히 용융시키지 못해 용사효율이 60% 정도로 아주 낮은 결점을 가지고 있다.In addition, the thermal spraying material of 2) uses only an oxidative pyrogenic metal powder in a high melting point raw material, so that the high melting point raw material is not sufficiently melted, and thus the spraying efficiency is about 60%.
또한, 상기 3)의 용사재료는 코크스분말을 첨가, 사용함으로써 2)의 용사재료와 같은 결점을 가지고 있다.In addition, the thermal spraying material of 3) has the same drawbacks as the thermal spraying material of 2) by adding and using coke powder.
또한, 상기 4)의 용사재료는 마그네시아 입자에 최대입경 44㎛ 이하의 저융점분말을 피복하여 제조함으로, 유동성은 다소 떨어지지만 모재에 대한 부착효율이 향상되는 장점을 가지고 있다.In addition, the thermal spraying material of 4) is manufactured by coating a low melting point powder having a maximum particle diameter of 44 μm or less on the magnesia particles, but the fluidity is somewhat reduced, but the adhesion efficiency to the base material is improved.
이와 같은 종래의 용사재들은 각각의 장, 단점을 가지고 있지만 제1도(a)에 나타난 바와 같이 용사직후 불꽃에 의한 열원이 없어지면 1600-1800℃ 전후로 가열된 용사시공체(1)의 온도가 급격히 떨어져 열충격에 의한 용사체(1)의 손상(6)이 수반되는 공통된 문제가 있다.Such conventional thermal spray materials have their advantages and disadvantages, but as shown in FIG. 1 (a), when the heat source of the flame disappears immediately after the thermal spraying, the temperature of the thermal sprayed construction body 1 heated to about 1600-1800 ° C. rapidly increases. There is a common problem involving the damage 6 of the thermal sprayed body 1 due to thermal shock.
본 발명은, 용사재료의 유동성은 분사피복형 용사재료 보다 다소 떨어지지만 불꽃용사장치내에서 수송성에 문제가 없는 범위 내에서 내화분말 재료에 단섬유를 첨가 분산함으로서 종래의 분말용사재료가 가지는 용사직후의 열충격손상을 억제하여 용사시공체의 강도 및 내구성이 향상될 수 있는 불꽃 용사용 내화분말재료를 제공하고자 하는데, 그 목적이 있다.According to the present invention, the flowability of the sprayed material is slightly lower than that of the spray-coated sprayed material, but shortly after the spraying of the conventional powdered sprayed material by adding and dispersing short fibers in the refractory powder material within a range without problems of transportability in the flame spraying device. The purpose of the present invention is to provide a fireproof powder material for flame spraying which can suppress thermal shock damage to improve the strength and durability of a sprayed body.
제1도 a)는 종래의 불꽃용사용 내화분말재료에 의한 용사시공체의 단면도.1 a) is a cross-sectional view of a sprayed body made of a conventional fire-resistant refractory powder material.
b)는 본 발명의 불꽃용사용 내화분말재료에 의한 용사시공체의 단면도.b) is a cross-sectional view of the sprayed body by the fire-resistant powder material for use in the flame of the present invention.
제2도 a)는 본 발명의 불꽃용사용 피복형 내화분말재료의 구성도.Figure 2 a) is a block diagram of the coating type refractory powder material for use in flames of the present invention.
b)는 본 발명의 불꽃용사용 비피복형 내화분말 재료의 구성도.b) is a block diagram of an uncoated fireproof powder material for use in flames of the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
1 : 용사시공체 2 : 모재내화물1: spraying body 2: base material refractory
3 : 시공층 중의 입자간물질 4 : 알루미나 입자3: intergranular material in the construction layer 4: alumina particles
5 : 시공층중의 균열 6 : 균열5: crack in construction layer 6: crack
7 : 단섬유 8 : 알루미나 입자에 피복된 저융점물질7: short fiber 8: low melting point material coated on alumina particles
9 : 저융점 물질로만된 조립인자9: assembling factor using only low melting point materials
10 : 알루미나-실리카-마그네시아계 복합입자10: Alumina-silica-magnesia composite particle
상기 목적을 달성하기 위한 본 발명은 통상의 피복형 또는 비피복형 불꽃용사용 내화분말재료에 섬유길이가 0.2mm 이하인 단섬유가 0.2-10중량% 함유되는 불꽃용사용 내화분말 재료에 관한 것이다.The present invention for achieving the above object relates to a fireproof powder material for use in flames containing 0.2-10% by weight of short fibers having a fiber length of 0.2 mm or less in a conventional coated or uncoated fireproof powder for use.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명은 종래의 마그네시아계, 알루미나-스피넬계, 실리카계인 내피복형 구상분말 또는 피복형 내화분말이 가지는 용사재료의 용사시공체 결함을 획기적으로 개선하기 위하여 상기 내화분말 재료에 단섬유를 함유하는데 특징이 있다. 이를 위해 우선, 상기 단섬유는 2000-2600℃ 의 불꽃속에서 0.1-0.3초 정도의 짧은 체류 시간내 쉽게 용융되지 않고, 상태도상에서 용사재료의 구성원료와 공융점을 쉽게 형성시키지 않고 용사시공체내에서 본래의 형상을 제대로 유지할 수 있는 종류의 것이면 적용이 가능하다. 보다 바람직한 종류로는 산화알루미늄 섬유, 산화지르코늄 섬유, 탄화규소 섬유, 카본섬유 등이다.The present invention includes a short fiber in the refractory powder material in order to drastically improve the thermal spraying defects of the thermal spraying material of the conventional magnesia-based, alumina-spinel-based, silica-based coated spherical powder or coated refractory powder. There is a characteristic. To this end, first, the short fibers are not easily melted in a short residence time of about 0.1-0.3 seconds in a flame of 2000-2600 ° C., and do not easily form a component and a eutectic point of the thermal spraying material in the thermal spraying body. It can be applied as long as it is of a kind that can properly maintain the original shape. More preferable types are aluminum oxide fiber, zirconium oxide fiber, silicon carbide fiber and carbon fiber.
상기와 같은 단섬유는 불꽃용사용 내화분말 재료의 최대입경보다 짧은 것이 라야만 기본적으로 적용이 가능하다. 그 이유는 용사재 최대입경 이상의 세라믹 장섬유가 함유되는 경우, 용사재의 유동성이 결정적으로 나빠질 뿐 아니라 용사장치의 관내수송에 중대한 결함을 일으키는 직접적인 원인이 되기 때문이다.Such short fibers are basically applicable only if they are shorter than the maximum particle size of the fireproof powder material for use in flames. The reason for this is that when the ceramic filament fiber having a maximum particle size of the thermal spray material is contained, the fluidity of the thermal spray material is not only deteriorated decisively, but also is a direct cause of serious defects in the transport of the thermal spray equipment.
통상, 이용되는 불꽃 용사용 내화분말 재료의 최대입경이 0.2mm 이하이므로 단섬유의 길이는 0.21mm 이하의 것으로 하되 분말 용사재 최대 입경의 50% 정도의 길이를 가지는 것이 가장 이상적이다. 이때 단섬유의 모양비(aspect ratio)는 문 제가 되지 않는다.Usually, since the maximum particle diameter of the flame spraying refractory powder material used is 0.2 mm or less, the length of the short fiber should be 0.21 mm or less, but it is most ideal to have a length of about 50% of the maximum particle diameter of the powder spray material. At this time, the aspect ratio of the short fibers is not a problem.
본 발명에 따라, 상기와 같은 길이를 가지는 단섬유를 0.2-10중량% 함유하는 것이 바람직한데, 그 이유는 0.2중량% 이하의 경우 섬유첨가에 따른 추가공정만 발생될 뿐 부착율이나 강도의 증진, 용사시공체내 균열감소 효과는 미흡하여 10중량%를 초과하는 경우 용사시공체의 강도는 약간 항상되지만 용사재료의 유동성이 급격히 나빠져서 용사시공성에 문제가 발생하기 때문이다.According to the present invention, it is preferable to contain 0.2-10% by weight of the short fibers having the length as described above, for the reason of 0.2% by weight or less, only the additional process occurs according to the addition of the fiber to increase the adhesion rate or strength However, if the spray reducing effect in the sprayed body is insufficient and the strength of the sprayed body is always slightly higher than 10% by weight, the fluidity of the thermal spraying material is rapidly deteriorated, which causes problems in spraying property.
한편, 상기와 같은 조건으로 단섬유를 불꽃용사용 내화분말재에 첨가한 용사재가 열충격에 의한 용사체 손상을 방지할 수 있는 작용을 제1, 2, 3 도를 통하여 설명한다. 제1도에 나타난 바와 같이, 종래의 용사재(제1도(a))의 경우 용사한 직 후 급냉에 의한 열충격으로 용사시공체(1) 표면과 내부에 결함, 즉 균열(6)이 발 생하며, 이때, 단섬유(7)를 일정량 첨가하는 발명의 용사재의 경우 제1도(b) 용사시공체(1)에서는 이와 같은 균열의 발생이 억제되어 용사시공체의 인성과 강도가 증진되는 효과를 얻을 수 있다.On the other hand, it will be described through the first, second, and third degree the effect that the thermal spraying material is added to the refractory powder used for the flame under the above conditions to prevent the thermal spray damage. As shown in FIG. 1, in the case of a conventional thermal spraying material (FIG. 1 (a)), a defect, that is, a crack 6, is formed on the surface and inside of the sprayed body 1 due to the thermal shock by quenching immediately after spraying. In this case, in the case of the thermal spraying material of the invention in which a predetermined amount of the short fibers 7 is added, the occurrence of such cracks is suppressed in the thermal spraying body 1 of FIG. 1 (b), thereby improving the toughness and strength of the thermal sprayed body. The effect can be obtained.
이때, 사용된 본 발명의 내화분말 재료인 용사재는 통상의 방법으로 제조된 피복형 내화분말(4,8)에 단섬유(7)를 첨가 분산시킨 제2도(a)와 같은 형과 통상의 방법으로 원료를 조합, 혼합, 성형, 소성, 분급의 방법으로 제조한 비피복형 내화분말(10)에 단섬유(7)를 첨가 분산시킨 제2도(b)와 같은 형이 있다.At this time, the thermal spraying material which is the refractory powder material of the present invention used is the same type as the second figure (a) in which the short fiber 7 is added and dispersed in the coated refractory powders 4 and 8 manufactured by a conventional method. There is a mold as shown in FIG. 2 (b) in which the short fibers 7 are added and dispersed in an uncoated fireproof powder 10 prepared by combining, mixing, molding, firing, and classifying the raw materials.
이하, 실시예를 통하여 본 발명을 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.
[실시예]EXAMPLE
하기표 1과 같이 조성되는 불꽃 용사용 내화분말재료를 분사속도 50kg/hr, 불꽃생성조건 LPG 15Nm3/hr, O275Nm3/hr 의 불꽃으로 내화물표면에 용사한 후 여러가지 특성을 측정한 다음 그 결과를 하기표 1에 나타내었다.After spraying the refractory powder used for the flame as shown in Table 1 at the spraying speed of 50 kg / hr, flame generation conditions LPG 15Nm 3 / hr, O 2 75Nm 3 / hr on the refractory surface and measuring various characteristics The results are shown in Table 1 below.
*1 : 입경 0.21mm 이하인 분사피복형 MgO 60% 급 분말용사재료* 1: Spray-coated MgO 60% powder spraying material with particle diameter of 0.21mm or less
*2 : 입경 0.21mm 이하인 알루미나-스피넬계 분말용사재료* 2: Alumina-Spinel-based powder spraying material having a particle diameter of 0.21 mm or less
*3 : 입경 0.21mm 이하인 실리카계 분말용사재료* 3: Silica-based powder spraying material having a particle diameter of 0.21 mm or less
*4 : 길이 0.21mm 이하인 섬유* 4: Fiber 0.21mm or less in length
*5 : ◎(발생없음) ○(흔적) △(미량발생) ×(미세균열 다량발생으로 표면불량)* 5: ◎ (No occurrence) ○ (Trace) △ (Minor occurrence) × (Surface defect due to large amount of microcracks)
상기 표 1에 나타난 바와 같이, MgO 60% 급 마그네시아계 피복형 내화분말에 산화알루미늄 단섬유를 첨가한 경우인 발명예(1-3)은 단섬유를 첨가하지 않은 비교예(1)과 비교하여 유동성은 미미하게 떨어지지만 강도의 향상과 상대적으로 기공율이 우수하였고, 특히 용사시공체의 결점인 균열이 발생하지 않았다.As shown in Table 1, Inventive Example (1-3) in which aluminum oxide short fibers were added to MgO 60% grade magnesia-based fireproof powder was compared with Comparative Example (1) without addition of short fibers. Although the fluidity was insignificant, the strength was improved and the porosity was relatively good. Particularly, the crack, which is a defect of the sprayed body, did not occur.
또한, 비피복형 내화분말재료에 단섬유를 적정량 첨가한 발명예(4-6)의 경우 또한 제반특성이 우수하였다.In addition, the invention example (4-6) in which an appropriate amount of short fibers was added to the uncoated fireproof powder material was also excellent in various characteristics.
반면, 단섬유 첨가량의 0.2% 이하인 비교예(8)의 경우 균열감소 효과가 없었고, 비교예(10-11)과 같이 단섬유의 첨가량이 10중량% 를 과도하게 초과되면 용사재료의 유동성이 급격히 떨어져 용사시공시 맥동현상이 빈번히 발생되고 용사시공체도 강도의 저하, 부착율의 감소등으로 오히려 역효과를 나타냈다.On the other hand, in the comparative example (8) having 0.2% or less of the short fiber addition amount, there was no crack reduction effect. When the addition amount of the short fiber excessively exceeded 10% by weight, as in the comparative example (10-11), the flowability of the thermal spraying material drastically increased. The pulsation phenomenon frequently occurred during spraying, and the sprayed body also showed the opposite effect due to the decrease in strength and the decrease in adhesion rate.
이와 같은 세라믹 단섬유는 1종으로 뿐 아니라 2종 혹은 3종으로 첨가하여도 무방하지만 첨가 공정이 복잡해질 뿐 상승효과는 희박하기 때문에 1종으로 첨가하는 것이 경제적이다. 또한, 단섬유의 첨가는 통상의 분체 혼련방법이면 대체로 가능하지만 가압혼련방법은 분체 입도의 감소나 피복입자의 부서짐 등으로 인해 권장할만한 방법은 아니며, 좋게는 브이형 혼련기(V-type mixer)와 같이 용사재료 자체에 외력이 가해지지 않는 혼합장치이면 사용이 가능하며, 세라믹 단섬유를 기계적으로 분산시킬 수 있는 고리(hook)와 같은 부속설비가 딸린 혼합장치를 사용하면 더욱 효과적이다.Such ceramic short fibers may be added not only in one kind but also in two or three kinds, but it is economical to add one kind because the addition process is complicated and the synergy is scarce. In addition, the addition of short fibers is generally possible if it is a conventional powder kneading method, but the pressure kneading method is not recommended due to the reduction of the particle size or the breaking of the coated particles, and is preferably a V-type mixer. If the mixing device is not applied to the thermal spray material itself, such as can be used, it is more effective to use a mixing device with an accessory such as a hook (hook) to mechanically disperse the ceramic short fibers.
본 발명의 세라믹 단섬유가 보강된 불꽃용사보수용 분말용사재료로 각종 공업용 노체의 손상된 내화물 부위를 용사 보수하는 경우, 특히 용사직후 급냉이 되는 환경아래에 있는 노체를 열간에서 불꽃용사보수할 경우, 용사시공체의 인성과 강도면에서 획기적인 향상효과를 얻을 수 있으며, 따라서, 노체수명의 연장과 내화물 비용의 절약을 도모할 수 있다.In the case of thermally repairing damaged refractory parts of various industrial furnaces with the thermal spraying powder spraying material reinforced with ceramic short fibers of the present invention, in particular, in the case of thermally thermally repairing a furnace body under an quenching environment immediately after thermal spraying, A drastic improvement in the toughness and strength of the thermal sprayed body can be achieved, thus extending the life of the furnace body and reducing the refractory cost.
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| KR100910452B1 (en) * | 2002-11-19 | 2009-08-04 | 주식회사 포스코 | Process for coating a continuous casting tundish |
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